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Sen. Elizabeth Warren slammed Donald Trump on Twitter

The Massachusetts Democrats jabbed the GOP nominee over claims of a "rigged election"

(CNN)Elizabeth Warren resumed her role as Donald Trump's chief antagonist on Wednesday, firing off a series of tweets blasting the Republican presidential nominee's recent claims that the election is "rigged."

"Give me a break, @realDonaldTrump," the Massachusetts senator said. "You're not losing because it's rigged. You're losing because we see through your creepy bullying."

Give me a break, @realDonaldTrump. You're not losing because it's rigged. You're losing because we see through your creepy bullying.

The Trump campaign did not immediately respond to a request for comment on Warren's latest salvo.

Warren has drawn the ire of Trump with her fiery criticisms both on Twitter and the campaign trail. Trump has responded in kind, repeatedly referring to Warren as "goofy" and "Pocahontas" -- the latter a reference to the controversy surrounding the senator's claims of Native American roots.

Warren's Wednesday tweetstorm came hours before the third and final presidential debate, and a day after President Barack Obama also chided Trump over his rigged election claims.

"You start whining before the game's even over?" Obama said during a news conference. "If whenever things are going badly for you, and you lose, you start blaming somebody else then you don't have what it takes to be in this job."

As his poll numbers have cratered in recent weeks, Trump has claimed that the election is being corrupted by voter fraud and a coordinated media campaign designed to sink his campaign. The candidate has urged supporters to monitor polling sites on Election Day.

Many Republicans have repudiated those claims, but Warren said Wednesday that Trump "didn't come up with the 'rigged' election himself."

"It's a longtime effort by the @GOP to delegitimize @TheDemocrats," she said.